Vibrating hammer.



No. 723,572. PATENTED MAR. 24, 1903. I H. M. BALDWIN. VIBRATING HAMMER.

APPLICATION FILED SEPT. 26, 1902.

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UNITED STATES PATENT ()FFICE.

HERBERT M. BALDWIN, OF NEW YORK, N. Y.

VIBRATING HAMMER.

SPECIFICATION forming part of Letters Patent No. 723,57 2, dated March 24, 1903.

Application filed September 25, 1902. Serial No. 124,723. (No model.)

To all whom it may concern:

Be it known that I, HERBERT M. BALDWIN, a citizen of the United States, residing at New York,county of Richmondfitate of New York, have invented certain new and useful Improvements in Vibrating Hammers, of which the following is a specification, reference being had to the drawings accompanying and forming part of the same.

My invention relates to the general class of tools in which a piston is made to vibrate rapidly to deliver a succession of blows upon an object; but it differs in a number of particulars from the devices hitherto known. While it may be employed in a great variety of arts, I have found it especially useful in metalfounding when it is necessary to jar or vibrate the pattern as the same is drawn from the sand. At the same time the tool may be used as an ordinary molders hammer for striking a heavy blow to loosen the pattern without employing the vibrator.

Obviously my invention is capable of many specific embodiments; but it consists, essentially, of a handle and a hollow head arranged at or near an end of the former transversely to the same, the head having within it a reciprocating piston, means being provided to vibrate the piston in the head with variable force and speed.

Referring now to the drawings, Figure 1 represents my hammer, the head being shown in vertical section. Fig. 2 is a modified form of head, and Fig. 3is a plan view of the same.

In the species which I have selected to illustrate my invention the reciprocation of the piston is effected by compressed air or steam admitted to the head 1 through a tubular handle 2, a thumb-operated valve 3 being provided in the latter by which the admission of air or steam is regulated. The head is arranged substantially at right angles to the handle, as shown, and carries a flanged piston 4, fitting closely but sliding freely therein. The construction of the piston, however, and the arrangement of the coacting passages of the head whereby the compressed air or steam causes the piston to oscillate are immaterial and form no part of the invention which forms the subject of the present application. It is desirable, of course, that the vibrator devices employed should give an efficient utilization of the power furnished. The head is provided at each end with a cap 5 6, as shown. Between the ends of the former and the caps are anvils 7, against which the piston strikes. On one 'or the other end a rubber cushion 8 may be secured, so that a swinging blow on a pattern will not injure the same. The resilient face also makes such a blow more elastic, and thus better loosens the pattern from the mold.

In using my device as a molders hammer one face of the head is held against the drawing-spike or. any part of the pattern as it is drawn from the sand. The valve 3 being pressed, the piston strikes the anvils alternately with the desired rapidity, the force of the blows being carried to the pattern by the cap which rests against the same. The pattern is thus jarred or vibrated as it leaves the sand, producing a clear sharp mold.

In the modification shown in Figs. 2 and 3 one face of the head is concaved and provided with a groove 9, into which the pattern-stem fits, so that the tool is more effectively held against the same. The other face is provided with means for holding a toolas, for example, a screw-socket 10into which the tool may be screwed, or jaws may be provided for the same purpose, as will be readily understood. Among the tools which may be used in this connection I may mention one comprisinga bar of some length having any desired conformation of face at one end. The other end being fastened to the hammer, the bar may be introduced into an opening and thus transmit the vibration to parts otherwise inaccessible. My hammer has also been found of value for massage purposes, in which case a short bar or plug with a cushioned face is used in the tool-holder. By reason of the tool being detachable cushion-faces of anysize may be used. By-holding such face against a part of the body a series of rapid vibratory blows may be delivered thereon, thus producing the desired massage efiect. The user not only has the curative effects of the rapidpercussions, but may also employ a swinging blow when heavier and less rapid strokes are desired. For the purpose'last described it is of course desirable thatthehammer itself be light in construction and design and plated or otherwise made of pleasing appearance.

Having now fully described my invention, what I claim is- As a new article of manufacture, a vibrating hammer also adapted to strike a swinging blow, comprising in combination, a comparatively long handle and acomparatively short head arranged transversely at one end of the same, whereby the device may be used as an ordinary hammer, said head being substantially cylindrical in form, havingits ends completely closed, and having in one end means for holding a tool, a piston in said head, coacting passages in the head and in the piston, and means for supplying compressed air to said passages to cause the piston to vibrate against the opposite closed ends of the head, substantially as and for the purposes set forth.

HERBERT M. BALDWIN. Witnesses:

S. S. DUNHAM, THOS. J. BYRNES. 

